Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.

Nicholas John McClellan, DO

Individual provider Pediatric Rheumatology Physician · NPI 1427410737

Nicholas John McClellan, DO is a Pediatric Rheumatology Physician in Marshfield, Wisconsin. Licensed in Michigan and Wisconsin. Registered with an NPI since 2016.

Licensed in
MI, WI
In the registry since
2016
Specialties on file
3
What do these letters mean?
DO — Doctor of Osteopathic Medicine
A fully licensed physician, trained like an MD with additional musculoskeletal training. Equivalent practice rights in all 50 states.

See every abbreviation used in this directory →

Practice location Address checks out

1000 N Oak Ave
Marshfield, WI 54449-5703
Phone: (715) 387-5511
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Pediatric Rheumatology Physician (primary) Taxonomy 2080P0216X · Licence 71985 (WI)
Pediatric Rheumatology Physician Taxonomy 2080P0216X · Licence 5101026041 (MI)
Rheumatology Physician Taxonomy 207RR0500X · Licence 71985 (WI)

Record details

NPI number1427410737
Entity typeIndividual (Type 1)
GenderMale
Credentials DO
Sole proprietorNo
NPI enumeratedMarch 25, 2016
Last updated in NPPESMarch 24, 2026
Certification dateMarch 24, 2026
Mailing address1000 N Oak Ave, Marshfield, WI 54449-5702